noun Western U.S.
a horse or pony used in herding cattle.
Origin of stock horse
First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for stockhorse
Historical Examples of stockhorse
We took the bits out of their mouths, and let them pick feed round about, with the bridle under their feet, stockhorse fashion.Robbery Under Arms
Thomas Alexander Browne, AKA Rolf Boldrewood
Australian a horse trained in the handling of stock
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012